Generate the activation scripts

Contributes to CURA-9365

generators/VirtualPythonEnv.py

@@ -23,13 +23,7 @@ class VirtualPythonEnv(Generator):
 
     @property
     def filename(self):
-        filepath = str(Path(self.conanfile.generators_folder).joinpath("activate"))
-        if self.conanfile.settings.get_safe("os") == "Windows":
-            if self.conanfile.conf.get("tools.env.virtualenv:powershell", check_type = bool):
-                filepath += ".ps1"
-            else:
-                filepath += ".bat"
-        return filepath
+        pass
 
     @property
     def content(self):
@@ -79,7 +73,6 @@ class VirtualPythonEnv(Generator):
         env.prepend_path("PATH", os.path.join(self.conanfile.build_folder, self._venv_path))
         env.prepend_path("PYTHONPATH", pythonpath)
         env.unset("PYTHONHOME")
-        env.define("PS1", f"({self.conanfile.name}) ${{PS1:-}}")
 
         envvars = env.vars(self.conanfile, scope = "run")
 
@@ -116,14 +109,21 @@ class VirtualPythonEnv(Generator):
                 self.conanfile.output.warn(f"Failed to find pip requirement file: {requirements_txt_path}")
 
         # Generate the Python Virtual Environment Script
-        template = Template("""\
-deactivate()
-{
-{% for k, v in envvars.items() %}export {{ k }}=$OLD_{{ k }}
-unset OLD_{{ k }}
-{% endfor %}}
-
-{% for k, v in envvars.items() %}export OLD_{{ k }}=${{ k }}
-export {{ k }}={{ v }}
-{% endfor %}""")
-        return template.render(envvars = envvars)
+        with open(Path(__file__).parent.joinpath("VirtualPythonEnvResources", "activate.bat.jinja"), "r") as f:
+            activate_bat = Template(f.read()).render(envvars = envvars, prompt = self.conanfile.name)
+
+        with open(Path(__file__).parent.joinpath("VirtualPythonEnvResources", "deactivate.bat.jinja"), "r") as f:
+            deactivate_bat = Template(f.read()).render(envvars = envvars)
+
+        with open(Path(__file__).parent.joinpath("VirtualPythonEnvResources", "Activate.ps1.jinja"), "r") as f:
+            activate_ps1 = Template(f.read()).render(envvars = envvars, prompt = self.conanfile.name)
+
+        with open(Path(__file__).parent.joinpath("VirtualPythonEnvResources", "activate.jinja"), "r") as f:
+            activate_sh = Template(f.read()).render(envvars = envvars, prompt = self.conanfile.name)
+
+        return {
+            str(Path(self.conanfile.build_folder, self._venv_path, "activate.bat")): activate_bat,
+            str(Path(self.conanfile.build_folder, self._venv_path, "deactivate.bat.jinja")): deactivate_bat,
+            str(Path(self.conanfile.build_folder, self._venv_path, "Activate.ps1")): activate_ps1,
+            str(Path(self.conanfile.build_folder, self._venv_path, "activate")): activate_sh
+        }

generators/VirtualPythonEnvResources/Activate.ps1.jinja

@@ -0,0 +1,77 @@
+<#
+.Synopsis
+Activate a Python virtual environment for the current PowerShell session.
+
+.Notes
+On Windows, it may be required to enable this Activate.ps1 script by setting the
+execution policy for the user. You can do this by issuing the following PowerShell
+command:
+
+PS C:\> Set-ExecutionPolicy -ExecutionPolicy RemoteSigned -Scope CurrentUser
+
+For more information on Execution Policies: 
+https://go.microsoft.com/fwlink/?LinkID=135170
+
+#>
+
+<#
+.Synopsis
+Remove all shell session elements added by the Activate script, including the
+addition of the virtual environment's Python executable from the beginning of
+the PATH variable.
+
+.Parameter NonDestructive
+If present, do not remove this function from the global namespace for the
+session.
+
+#>
+function global:deactivate ([switch]$NonDestructive) {
+    # Revert to original values
+
+    # The prior prompt:
+    if (Test-Path -Path Function:_OLD_VIRTUAL_PROMPT) {
+        Copy-Item -Path Function:_OLD_VIRTUAL_PROMPT -Destination Function:prompt
+        Remove-Item -Path Function:_OLD_VIRTUAL_PROMPT
+    }
+
+    if (Test-Path -Path Env:VIRTUAL_ENV_PROMPT) {
+        Remove-Item -Path env:VIRTUAL_ENV_PROMPT
+    }
+
+    # Just remove the _PYTHON_VENV_PROMPT_PREFIX altogether:
+    if (Get-Variable -Name "_PYTHON_VENV_PROMPT_PREFIX" -ErrorAction SilentlyContinue) {
+        Remove-Variable -Name _PYTHON_VENV_PROMPT_PREFIX -Scope Global -Force
+    }
+
+    {% for var, value in envvars.items() %}if (Test-Path -Path Env:_OLD_{{ var }}) {
+        Copy-Item -Path Env:_OLD_{{ var }} -Destination Env:{{ var }}
+        Remove-Item -Path Env:_OLD_{{ var }}
+    } else {
+        if (Test-Path -Path Env:{{ var }}) {
+            Remove-Item -Path Env:{{ var }}
+        }
+    }
+    {% endfor %}
+    # Leave deactivate function in the global namespace if requested:
+    if (-not $NonDestructive) {
+        Remove-Item -Path function:deactivate
+    }
+}
+
+Copy-Item -Path Env:PATH -Destination Env:_OLD_PATH
+
+{% for var, value in envvars.items() %}if (Test-Path -Path Env:{{ var }}) {
+    Copy-Item -Path Env:{{ var }} -Destination Env:_OLD_{{ var }}
+}
+$Env:{{ var }} = "{{ value }}"
+{% endfor %}
+
+function global:_OLD_VIRTUAL_PROMPT { "" }
+Copy-Item -Path function:prompt -Destination function:_OLD_VIRTUAL_PROMPT
+New-Variable -Name _PYTHON_VENV_PROMPT_PREFIX -Description "Python virtual environment prompt prefix" -Scope Global -Option ReadOnly -Visibility Public -Value {{ prompt }}
+
+function global:prompt {
+    Write-Host -NoNewline -ForegroundColor Green "($_PYTHON_VENV_PROMPT_PREFIX) "
+    _OLD_VIRTUAL_PROMPT
+}
+$env:VIRTUAL_ENV_PROMPT = "{{ prompt }}"

generators/VirtualPythonEnvResources/activate.bat.jinja

@@ -0,0 +1,19 @@
+@echo off
+
+rem This file is UTF-8 encoded, so we need to update the current code page while executing it
+for /f "tokens=2 delims=:." %%a in ('"%SystemRoot%\System32\chcp.com"') do (
+    set _OLD_CODEPAGE=%%a
+)
+if defined _OLD_CODEPAGE (
+    "%SystemRoot%\System32\chcp.com" 65001 > nul
+)
+
+{% for var, value in envvars.items() %}set _OLD_{{ var }}=%PATH%
+set {{ var }}={{ value }}
+{% endfor %}
+set PATH=%VIRTUAL_ENV%\Scripts;%PATH%
+:END
+if defined _OLD_CODEPAGE (
+    "%SystemRoot%\System32\chcp.com" %_OLD_CODEPAGE% > nul
+    set _OLD_CODEPAGE=
+)

generators/VirtualPythonEnvResources/activate.jinja

@@ -0,0 +1,32 @@
+# This file must be used with "source bin/activate" *from bash*
+# you cannot run it directly
+
+deactivate () {
+    # reset old environment variables
+    {% for var in envvars.keys() %}if [ -n "$_OLD_{{ var }}" ] ; then
+        {{ var }}="$_OLD_{{ var }}"
+        export {{ var }}
+        unset _OLD_{{ var }}
+    then
+        unset {{ var }}
+    fi
+    {% endfor %}
+
+    if [ -n "${_OLD_VIRTUAL_PS1}" ] ; then
+        PS1="${_OLD_VIRTUAL_PS1}"
+        export PS1
+        unset _OLD_VIRTUAL_PS1
+    fi
+}
+
+{% for var, value in envvars.items() %}if [ -n "${{ var }}" ] ; then
+    _OLD_{{ var }}="${{ var }}"
+    export _OLD_{{ var }}
+fi
+{{ var }}="{{ value }}"
+export {{ var }}
+{% endfor %}
+
+_OLD_VIRTUAL_PS1="${PS1:-}"
+PS1="({{ prompt }}) ${PS1:-}"
+export PS1

generators/VirtualPythonEnvResources/deactivate.bat.jinja

@@ -0,0 +1,9 @@
+@echo off
+
+{% for var in envvars.keys() %}if defined _OLD_{{ var }} (
+    set "{{ var }}=%_OLD_{{ var }}%"
+)
+set _OLD_{{ var }}=
+{% endfor %}
+
+:END